Long and narrow frieght cars

Kurt Laughlin <fleeta@...>

Awhile back someone was wondering if there was a formula for determining the width of long freight cars. According to the Plate B (steam era) clearance standard, the maximum car width was 10 ft 8 in so long as the truck centers were 41-3 or less. For longer cars there was a graph of max width vs. truck center distance. Although the line is slightly curved, the formula is approximately (+/- 1 inch)

w = 162 - .8 * L

where w is the max width in inches and L is the center distance in feet.